Safety-guard for emery-wheels.



E?, J. WIL'LBTT.

SAFETY GUARD TUB, EMERY WBILS.

APFLICATION FILEI AUG` 18, 15,113.

.Fama/ned Nrw. W,

" i @Tilt i Specification of Letters Patent.

Patented hier. it?. toilet.

Application filed August la, 1913. Serial No. 785,321.

To @ZZ 'whom 'it may concern Y lie it known that l, GEORGE J. WrLLn'rr a citizen of the United States, residingF at Mil 'aukee, in the county of li/lilwaukee and State of Visconsin, have invented certain new and useful Improvements in Safety- Gruards for lilmery-VVheels, of which the .tollowing is a Specification.

My invention relates to safety guards ior ernery wheels and has particular reference to a novel casing adapted to cover substantially the entire wheel. 'I

It is not unusual in practice for einer-y wheels to become broken and to cause serious injury to workmen hy dying pieces. This has been sought to he (wei-Colnel in many ways, some of the forms ot guards being quite Satisfactory. However, l believe that none of the forms provide ior a complete inclosing of the wheel together with means for adjusting the guard as the face or periphery thereof wears away.

One of the objects therefore, of my inrentionv is to provide an inclosing guard ior an eniery wheel together with means to "adjusting the guard to keep the cutting surf-.ice of the wheel in proper position 'for work.

Another Objectis to provide means where by such a guard inay he adjusted only to a limited extent to the end that a Wheel may 'ne used on the saine arbor for only a portion of its lire. it is common in many shops to provide the emcry-wheel arher with two speeds, a low speed for a large wheel and a higher speed for the wheel when its surface 'becomes worn down, to the end that substantially the saine j'ieripheral speed may loe ohtained irrespective of the diameter ot the wheel. This works suecesefully unlessl the operator fails to change the speeds when a new large wheel is applied. It the .speed not changed the wiieei almost sure to burst. in my construction ,lt rovide but a single arhor Speed and allow tor adjustment oi the guard whereby to utiliz/.e only a portion of the wheel. illhen the limit, oli adj ustinent of the guard has heen reached. the wheel taken cli and placed on. an arbor designed for a sn'ialler wheel and a Correspending` guard juz-.ced thereon. For instance. in the preferred iorni ot my (guard, l provide for an. adjustment of two inches. it twentytour ini-li n'l'ieel' may thus he used until its diameter twenty inches. t .ie-then re nioyei. and placed on an arbor designed i'or a twenty inch wheel with a guard constructed accordingly. lt is used on this, arbor until four inches oi' the diameter has been worn away whereupon it is renun'cd and placed on an arhordesigned for a sixteen inch wheel and so on until the wheel is conipletcly worn. This reduces loss ia breakage and avoids the possibility of injrry due to excessive speeds.

My ynovel guard is preferably composed of three steel castings, an adjusting screw and a tool rest. The inelosingl guard castings are iuade thick, the peripheral wall being,l three- 'fourthe ot' an ineh and the side walis onediali an ineh thick to prevent the possibility of the portions ot' the wheel breakingl through in case the wheel should burst. Notonly does such ay guard ohviate the danger due to the hoisting oit the wheel lout it enforces the use of the wheel in such position that l sparks from the wheel cannot cause injury either to the workman or associates.

The invention wili he more readily understood by reference to the accompanying wdrawings, wherein, Figure l is a eide View ci? in emery wheel inclosed in a guard such as contemplated by me; Fig. Q is an edge elei'ation of the construction shown in Fig. l; liig'. 3 is a sectional elevation taken on the line 3--3 of Fig. 2, and, Fig. i is a transI verse :vertical section taken on the line fir-4 oi' Fig. 3. i

Referring more jmrtieularly to tl e d rawings it will be seen that l provide a standard l0, having a hea ing 1l, for an arbor l?. To this a rher secured in the usual manner an einerjv wheel 18. Un the standard itl. l', provide hraekets 14, to which is secured a casting; 15, having; a depending: apertured lue: lo, and tuo machined upper surfaces- 1.7, linished to provide a ril) 1S.

The easing forming; my novel guard is composed et" a steel casting' havingr a web 19, and a peripheral [iange 20, this iange loeing' apertured at intervals to accommodate boite iii, tra means oi which the face plate secured to the flange. The weh 19, 2G and tace plate :22, are eut-away at r ypoee j iortion of theinery wheel u ie worl-f; pei rinel hy; the wheel i through this eu.V iway portion. A. tool ies; t, is secured to the inii-tiii ny suitable bolts this tool rest hein g renewahle as required when worn. lroieetinaj inwardly :from the weh l@ are brackets 2.5, having machined lower surfaces providingl a groove litting the rih i8 on the casting` 15, the construction being such that the casing may be slid on the casting'15 by loosening the bolts 27. Also projecting inwardly from the web 19 is a bracket 28, -apertured to accommodate an adjusting bolt 29, which bolt is threaded into the apertured lug 16, on the casting 15. By means of the bolt 29, the

' easing may be moved transversely of the wheel arbor as required. To provide a fun ther support for the casing I cast an additional bracket 30, on the web 19, at the lower portion thereof, this bracket cooperating with a slotted bracket 31, secured to the standard 10. It will be noted that the notch or cut-away portion 23, is provided on a horizontal line coincident with the Wheel arbor. This is suitable for certain classes of grinding. It vWill be understood, hoW- ever, that the eut away portion may -be rovided at other points and may be of di erent formas required for varieties of Work.

i i Wmuiiluiniawau rrrrrr .on said arbor, a casingl substantially entirely surrounding said grinding Wheel and provided with a notch whereby a portion of said grinding Wheel is exposed, a pair of brackets extending inwardly from said casing, said brackets having a sliding engagement with said support, and screw means for adjusting 35V said casing transversely of said arbor, substantially as described.

GEORGE J. VILLETT.

Witnesses E. G. GRAENY, W. J. KAYE. 

